MKS Micro-Baratron 870B, Инструкция по эксплуатации, Страница: 53 / 68

Chapter Four: Operation How To Adjust the Zero
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Chapter Four: Operation
How To Adjust the Zero
All pressure transducers require initial and periodic zero adjustments. Prior to initial operation and
during periodic maintenance you must check the transducer zero to verify the proper output. The
zero can be set (or reset) by adjusting the
ZERO
potentiometer on the side of the transducer
(refer to Figure 1, page 25, and Figure 3, page 27) or at the front panel of any MKS Power
Supply/Readout being used.
To achieve the full dynamic range specified for the transducer, the zero adjustment must be made
at a pressure one decade lower than the transducer’s minimum resolution (0.001% of FS).
Zeroing a transducer above its stated minimum resolution creates a
zero offset relative to true
absolute pressure. All subsequent readings are then linear and accurate relative to the offset
value .
Note If available pressures are not sufficiently low to set the transducer zero,
you may use a vacuum leak detector with sufficient vacuum pumping (to
achieve proper zeroing pressures). In this case, mount the transducer on
the leak detector
in the same plane of orientation as it will be during
actual use .